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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 20 (Engine Control System Self-Diagnostics) >> Diagnostic Tests >> DTC P0301: Cylinder No. 1 Misfire Detected, DTC P0302: Cylinder No. 2 Misfire Detected, DTC P0303: Cylinder No. 3 Misfire Detected &/Or DTC P0304: Cylinder No. 4 Misfire Detected >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2002 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.

If misfire cannot be reproduced, the reason may be because vehicle was driven with a lack of fuel, improper fuel, fouled spark plug or etc. Using Toyota hand-held tester or scan tool, read FREEZE FRAME data. Freeze frame data records engine conditions when malfunction is detected. If COOLANT TEMP displayed in freeze frame data is less than 176°F (80°C), there is a possibility that misfire only exists during warm-up.

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